5 files changed, 34 insertions, 27 deletions
diff --git a/activemodel/Rakefile b/activemodel/Rakefile
index 1f4a8466c9..f098ce0671 100755
--- a/activemodel/Rakefile
+++ b/activemodel/Rakefile
@@ -15,7 +15,6 @@ task :default => :test
 Rake::TestTask.new do |t|
   t.libs << "#{dir}/test"
   t.test_files = Dir.glob("#{dir}/test/cases/**/*_test.rb").sort
-  t.verbose = true
   t.warning = true
 end
 
diff --git a/activemodel/lib/active_model.rb b/activemodel/lib/active_model.rb
index 505e16c195..e0de27b96d 100644
--- a/activemodel/lib/active_model.rb
+++ b/activemodel/lib/active_model.rb
@@ -21,33 +21,37 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #++
 
-activesupport_path = "#{File.dirname(__FILE__)}/../../activesupport/lib"
-$:.unshift(activesupport_path) if File.directory?(activesupport_path)
+activesupport_path = File.expand_path('../../../activesupport/lib', __FILE__)
+$:.unshift(activesupport_path) if File.directory?(activesupport_path) && !$:.include?(activesupport_path)
 require 'active_support'
 
+
 module ActiveModel
-  autoload :AttributeMethods, 'active_model/attribute_methods'
-  autoload :Conversion, 'active_model/conversion'
-  autoload :DeprecatedErrorMethods, 'active_model/deprecated_error_methods'
-  autoload :Dirty, 'active_model/dirty'
-  autoload :Errors, 'active_model/errors'
-  autoload :Lint, 'active_model/lint'
-  autoload :Name, 'active_model/naming'
-  autoload :Naming, 'active_model/naming'
-  autoload :Observer, 'active_model/observing'
-  autoload :Observing, 'active_model/observing'
-  autoload :Serialization, 'active_model/serialization'
-  autoload :StateMachine, 'active_model/state_machine'
-  autoload :TestCase, 'active_model/test_case'
-  autoload :Translation, 'active_model/translation'
-  autoload :Validations, 'active_model/validations'
-  autoload :ValidationsRepairHelper, 'active_model/validations_repair_helper'
-  autoload :Validator, 'active_model/validator'
-  autoload :VERSION, 'active_model/version'
+  extend ActiveSupport::Autoload
+
+  autoload :AttributeMethods
+  autoload :Conversion
+  autoload :DeprecatedErrorMethods
+  autoload :Dirty
+  autoload :Errors
+  autoload :Lint
+  autoload :Name,         'active_model/naming'
+  autoload :Naming
+  autoload :Observer,     'active_model/observing'
+  autoload :Observing
+  autoload :Serialization
+  autoload :StateMachine
+  autoload :Translation
+  autoload :Validations
+  autoload :ValidationsRepairHelper
+  autoload :Validator
+  autoload :VERSION
 
   module Serializers
-    autoload :JSON, 'active_model/serializers/json'
-    autoload :Xml, 'active_model/serializers/xml'
+    extend ActiveSupport::Autoload
+
+    autoload :JSON
+    autoload :Xml
   end
 end
 
diff --git a/activemodel/lib/active_model/attribute_methods.rb b/activemodel/lib/active_model/attribute_methods.rb
index 977a101277..8f855958c6 100644
--- a/activemodel/lib/active_model/attribute_methods.rb
+++ b/activemodel/lib/active_model/attribute_methods.rb
@@ -235,6 +235,10 @@ module ActiveModel
     # It's also possible to instantiate related objects, so a Client class belonging to the clients
     # table with a +master_id+ foreign key can instantiate master through Client#master.
     def method_missing(method_id, *args, &block)
+      if method_id == :to_ary || method_id == :to_str
+        raise NoMethodError, "undefined method `#{method_id}' for #{inspect}:#{self.class}"
+      end
+
       method_name = method_id.to_s
       if match = match_attribute_method?(method_name)
         guard_private_attribute_method!(method_name, args)
diff --git a/activemodel/test/cases/helper.rb b/activemodel/test/cases/helper.rb
index c1a3f6a4a7..30193956ea 100644
--- a/activemodel/test/cases/helper.rb
+++ b/activemodel/test/cases/helper.rb
@@ -1,15 +1,14 @@
-root = File.expand_path('../../../..', __FILE__)
 begin
-  require "#{root}/vendor/gems/environment"
+  require File.expand_path('../../../../vendor/gems/environment', __FILE__)
 rescue LoadError
-  $:.unshift("#{root}/activesupport/lib")
 end
 
-lib = File.expand_path("#{File.dirname(__FILE__)}/../../lib")
+lib = File.expand_path('../../../lib', __FILE__)
 $:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
 
 require 'config'
 require 'active_model'
+require 'active_model/test_case'
 
 # Show backtraces for deprecated behavior for quicker cleanup.
 ActiveSupport::Deprecation.debug = true
diff --git a/activemodel/test/cases/tests_database.rb b/activemodel/test/cases/tests_database.rb
index 8dd00ea147..79668dd941 100644
--- a/activemodel/test/cases/tests_database.rb
+++ b/activemodel/test/cases/tests_database.rb
@@ -2,6 +2,7 @@ require 'logger'
 
 $:.unshift(File.dirname(__FILE__) + '/../../../activerecord/lib')
 require 'active_record'
+require 'active_record/test_case'
 require 'active_record/fixtures'
 
 module ActiveModel